July 31, 2010 update: A coworker sent me a scan of this wonderful postcard from, I am guessing, the early 1960s, showing tourists or engineers examining the Mississippi Basin Model. They are standing at the Vicksburg harbor project. Close to the camera, you can see the old Hwy US 80 bridge where it crosses the river from Vicksburg to Delta, Louisiana. The Interstate 20 bridge has not yet been built.
How times have changed: the gent is wearing a necktie and the ladies are elegantly dressed. In 50 years, we have become a nation of swine.
Sections of the model might be recovered and moved to Vicksburg to become a part of the new transportation museum. The museum will be on Washington Street near the old Levee Street Depot. I do not know if water will be run through the model; that would be a fantastic way to demonstrate the technology of a physical model.
July 2015 update: None of this old model was reused. It continues to languish and decay. Much of the remaining machinery has been looted.